engleski

Electrochemical analysis of carrageenans. The effect of acetate concentration.

κ-, ι-, and λ-carrageenans are polysaccharides (PSs) which produce electrocatalytic chronopotentiometric peak H in acetate buffer (pH 5.2) on the hanging mercury drop electrode (HMDE). Here we show that this peak (Ep~-1.8V) increases with the acetate concentration. Using a. c. voltammetry we found that the appearance and the observed increase of peak H is accompanied by a decrease of capacitive current below the background electrolyte around -1.8 V, suggesting strong adsorption of the negatively charged PS at the negatively charged HMDE. Compared to carrageenans, dextran did not produce peak H and did not strongly adsorb at negatively charged electrode.

carrageenans ; chronopotentiometry ; peak H ; a. c. voltammetry ; acetate buffer

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